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Tip: How To Use Generic .Net Classes in IronRuby

In the latest version of IronRuby (0.3), the ability to use Generic .Net classes was added. I couldn’t find anywhere how to do that so I dug it out of the code and now I’ll share it with you!

Example #1 - List

This is how to define an Int32 list, add two numbers to it and print them:

list = System::Collections::Generic::List[System::Int32].new

list.add 4
list.add 12

list.each { |x| puts x }

Of course we can also use Ruby type like Numeric, String, etc.

Example #2 – Dictionary

This is how to declare a number-string dictionary, add values to it and print them:

dict = System::Collections::Generic::Dictionary[Fixnum, String].new

dict.add 1, "Hey"
dict.add 15, "There"

dict.each { |x| puts "#{x.key} - #{x.value}" }

 

All the best,
Shay.

Comments (1) -

I would like to override the default behavior of a .net class, how can I declare a generic class in ruby?

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